Dispatcher and Instance

[Former Member]

What is the difference between a dispatcher and an instance, and the CI and the Application server?

When I use the configtool I see that there are (in my installation) 8 instances, each with a dispatcher.

I also see there is "Global" dispatcher and server configuration - I assume that the Global dispatcher configuration is for all the dispatchers and the Global server configuration is for all the servers.

I assume that individual setting override the global settings.

Am I correct?

Thanks

Patrick

[benjamin_houttuin · Accepted solution]

Hi Patrick,

start reading this article (including the child nodes) http://help.sap.com/saphelp_nw70ehp2/helpdata/en/e1/b5443e02a9ab4186a6e1240a9a2455/frameset.htm

this wil explain alot and has nice figures to visualize it all

Cheers,

B

[former_member227281]

I assume that individual setting override the global settings. - The answer is yes.

Am I correct? - correct.

==========================================================

What is the difference between a dispatcher and an instance, and the CI and the Application server?

Answer: Single java stack will have one or more than one instance. The instance contains java related services and memory allocated. Every instance will have Dispatcher. Each dispacther will have Server node which process your java /J2EE application(like work process in Abap). There will be more than one server node depending on the size of users. If ur compnay has low end users then one server node is sufficient. If more end users then u can configure more than one server node.

Each server node will have collection of application services. If all services are up, then server node will be up an dthen dispatcher will be up. Then instance will be started.

If one of services in server node is down then sever node will not be started ad in turn dispatcher will be shut and the instance will be down.

=======================================

Regards

APR